[BUGFIX] Text/plain outputs always in unicode

src/test/java/net/sourceforge/plantuml/servlet/AllTests.java

@@ -14,6 +14,7 @@ public class AllTests extends TestSuite {
         suite.addTestSuite(TestSVG.class);
         suite.addTestSuite(TestProxy.class);
         suite.addTestSuite(TestMap.class);
+        suite.addTestSuite(TestCharset.class);
         // $JUnit-END$
         return suite;
     }

src/test/java/net/sourceforge/plantuml/servlet/TestAsciiArt.java

@@ -17,6 +17,7 @@ public class TestAsciiArt extends WebappTestCase {
         // Analyze response
         // Verifies the Content-Type header
         assertEquals("Response content type is not TEXT PLAIN", "text/plain", response.getContentType());
+        assertEquals("Response character set is not UTF-8", "UTF-8", response.getCharacterSet());
         // Get the content and verify its size
         String diagram = response.getText();
         int diagramLen = diagram.length();

src/test/java/net/sourceforge/plantuml/servlet/TestMap.java

@@ -19,7 +19,7 @@ public class TestMap extends WebappTestCase {
         // Analyze response
         // Verifies the Content-Type header
         assertEquals("Response content type is not TEXT PLAIN", "text/plain", response.getContentType()); 
-        assertEquals("Response character set is not ISO-8859-1", "ISO-8859-1", response.getCharacterSet());
+        assertEquals("Response character set is not UTF-8", "UTF-8", response.getCharacterSet());
         // Get the content, check its first characters and verify its size
         String diagram = response.getText();
         assertTrue("Response content is not starting with <area", diagram.startsWith("<area"));